Yet smartphones have an oft-overlooked downside: when they end up in the wrong hands, they offer overreaching agents of the state, thieves, hackers, and other wrongdoers an unparalleled avenue for uncovering and abusing the volumes of sensitive personal information we increasingly store on our mobile phones.

Over on Ars Technica, I have a long feature story that examines the constitutional and technical issues surrounding police searches of mobile phones: